<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        li {
            list-style: none;
        }
        .tab {
            width: 978px;
            margin: 100px auto;
        }
        .tab_list {
            margin-top: 50px;
            padding: 0;
            height: 39px;
            width: 976px;
            border: 1px soild #eee;
            border-bottom: 1px solid red;
            background-color: rgb(247,247,247);
        }
        .tab_list li {
            display: inline-block;
            height: 19px;
            line-height: 19px;
            padding: 10px 20px;
            text-align: center;
            cursor: pointer;
        }
        .tab_list .current {
            background-color: #c81623;
            color: #fff;
        }
        
        .item {
            display: none;
        }
    </style>

</head>
<body>
    <div class = "tab">
        <div class = "tab_list">
            <ul>
                <li class = "current">商品介绍</li>
                <li>规格与包装</li>
                <li>售后保障</li>
                <li>商品评价(50000)</li>
                <li>手机社区</li>
            </ul>
        </div>
        <div class = "tab_con">
            <div class = "item" style = "display: block;">
                商品介绍模块内容
            </div>
            <div class = "item">
                规格与包装模块内容
            </div>
            <div class = "item">
                售后保障模块内容
            </div>
            <div class = "item">
                商品评价模块内容
            </div>
            <div class = "item">
                手机社区模块内容
            </div>
        </div>
    </div>
    <script>
        var tab_list = document.querySelector('tab_list');
        var lis = document.querySelectorAll('li');
        var items = document.querySelectorAll('.item');
        for(var i = 0; i < lis.length; i++){
            //开始给5个li设置索引号
            lis[i].setAttribute('index', i);
            lis[i].onclick = function(){
                for(var i = 0; i < lis.length; i++){
                    lis[i].className = '';
                }
                this.className = 'current';
                //2.下面的显示内容模块
                var index = this.getAttribute('index');
                for(var i = 0; i < items.length; i++){
                    items[i].style.display = 'none';
                }
                items[index].style.display = 'block';
            }
        }
    </script>
</body>
</html>